Reusing images in PDF rendered from WordDocument using DocIORenderer

I am trying to convert a .docx to PDF with a letterhead in .net core.
I have created a .docx and put an image in the header thats spans the complete page.
That works perfectly even when I add pages.
I use DocIORenderer to render to a .pdf file.
However, the docs state that the image should be reused in the resulting pdf and it looks like it is not:
The background image is relatively large, and just adding pages significantly add to the pdf file size (600Kb+ per page).

//Loads an existing Word document WordDocumentwordDocument = newWordDocument("Sample.docx", FormatType.Docx); //Initializes the ChartToImageConverter for converting charts during Word to pdf conversion wordDocument.ChartToImageConverter = newChartToImageConverter(); //Creates an instance of the DocToPDFConverter - responsible for Word to PDF conversion DocToPDFConverterconverter = newDocToPDFConverter(); //Sets true to enable fast rendering . converter.Settings.EnableFastRendering = true; //Sets a value indicating whether to optimize the memory usage for the identical images in Word to PDF conversion . converter.Settings.OptimizeIdenticalImages = true; //Converts Word document into PDF document PdfDocumentpdfDocument = converter.ConvertToPDF(wordDocument); //Saves the PDF file to file system pdfDocument.Save("WordtoPDF.pdf"); //Closes the instance of document objects pdfDocument.Close(true); wordDocument.Close();

At present, we do not have support to identify the identical (duplicate) images in .NET Core. We have already logged this as a feature. We have planned to implement this feature in our upcoming 2019 Volume 3 release, which is estimated to be available in the month of September tentatively.

EnableFastRendering property not available in Core:

In Non-Core platforms, by default we convert Word document to PDF using EMF rendering approach and so to achieve Word to PDF conversion using direct PDF approach we have provided the EnableFastRendering property.

Whereas, in Core by default we are converting the Word document to PDF faster using direct PDF approach rather than EMF rendering approach and so we have not provided this property in Core.

Please use our below UG documentation page for more details about fast Rendering:
https://help.syncfusion.com/file-formats/docio/word-to-pdf#fast-rendering   

Please let us know if you have any questions.

Regards,
Vijayasurya A

Hi Bob,

Thank you for your patience.

We will reduce the generating PDF file size while using identical images in Word to PDF conversion and this implementation will get included in our upcoming 2019 Volume 3 release which is estimated to be available in the month of October.

Please let us know if you still require patch for this implementation.

Regards,
Vijayasurya A

Hi Bob,

Thank you for your update.

Please find the details for your queries below as follows:

As per your request, we will provide the patch for the reported issue with “Generated PDF size is large when use identical images in direct PDF approach”, which is estimated to be available on 23^rd August 2019.

Note: Since you have mentioned your product version as “v17.2.0.40” (Weekly release). At present, we are not providing a patch for weekly NuGet release and so we have provided you patch for the reported issue in version “17.2.0.34” version.

As mentioned earlier, at present, we do not have support to identify identical images in .NET Core. We have already logged this as a feature and also, we have planned to implement this feature in our upcoming 2019 Volume 3 release, which is estimated to be available in the month of October tentatively.

Please let us know if you have any questions.

Regards,
Vijayasurya A

//Open the file as Stream FileStream docStream = new FileStream(@"Template.docx", FileMode.Open, FileAccess.Read); //Loads file stream into Word document WordDocument wordDocument = new WordDocument(docStream, Syncfusion.DocIO.FormatType.Automatic); //Instantiation of DocIORenderer for Word to PDF conversion DocIORenderer render = new DocIORenderer(); //Sets true to optimize the memory usage for identical images render.Settings.OptimizeIdenticalImages = true; //Converts Word document into PDF document PdfDocument pdfDocument = render.ConvertToPDF(wordDocument); //Releases all resources used by the Word document and DocIO Renderer objects render.Dispose(); wordDocument.Dispose(); //Saves the PDF file MemoryStream outputStream = new MemoryStream(); pdfDocument.Save(outputStream); //Closes the instance of PDF document object pdfDocument.Close();

//Loads an existing Word document WordDocumentwordDocument = newWordDocument("Sample.docx",FormatType.Docx); //Initializes the ChartToImageConverter for converting charts during Word to pdf conversion wordDocument.ChartToImageConverter = newChartToImageConverter(); //Creates an instance of the DocToPDFConverter - responsible for Word to PDF conversion DocToPDFConverterconverter = newDocToPDFConverter(); //Sets true to enable fast rendering . converter.Settings.EnableFastRendering = true; //Sets a value indicating whether to optimize the memory usage for the identical images in Word to PDF conversion . converter.Settings.OptimizeIdenticalImages = true; //Converts Word document into PDF document PdfDocumentpdfDocument = converter.ConvertToPDF(wordDocument); //Saves the PDF file to file system pdfDocument.Save("WordtoPDF.pdf"); //Closes the instance of document objects pdfDocument.Close(true); wordDocument.Close();